Density-density correlation function of a system of molecular excitons

The correlations in a system of molecular excitons are considered in the framework of a two-level scheme with dynamic interaction. The density-density correlation function is found in an approximation in which the process of Iinearization of the interaction operator takes into account alI pairings and also the kinematic properties of the exeiton operators. The calculated binary correlation function is compared with the binary correlation functions of Bose and Fermi gases.